Endoscopic and Microsurgical Anatomy of the Cranial Base

194 Pages·2010·60.8 MB·English

by  Prof. em. Dr. med. Wolfgang Seeger (auth.)

<£l
SpringerWienNewYork
Wolfgang Seeger
Endoscopic and Microsurgical Anatomy
of the Cranial Base
In collaboration with
Jan Kaminsky and Astrid Weyerbrock
SpringerWienNewYork
Prof. em. Dr. med. Wolfgang Seeger
Department of Neurosurgery, University Hospital Freiburg, Freiburg/Br.,
Germany
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Preface
Neuroendoscopic transnasal surgical approaches have become increasingly common
for some time, and have started to replace microsurgical techniques in pituitary surgery.
Endoscopic transnasal approaches have also been recently used in some neurosurgical
centres to reach pre- and retrosellar areas and targets localized in the basal cisterns. One
major factor is the localization of the carotid artery between the siphon and aperture
externa of the carotid canal at the base of the petrous bone.
The following areas are especially critical:
1. the anterior siphon area
2. the area between the bottom of the sphenoid sinus and the base of Processus ptery-
goideus
3. the proximity of the carotid canal to the Tuba Eustachii, the labyrinth, Bulbus supe-
rior of the internal jugular vein and the facial nerve.
Some segments of the course of the carotid artery are well known but they have rarely
been surgical target areas using transnasal approaches to date.
This has changed since the introduction of modern imaging techniques, especially
neuronavigation. It has become possible to identify and localize structures of the skull
and extra- and intracranial structures in any desired plane.
The study of the anatomy of the skull base should not exclude experience gained in
cadaver skull dissections. In contrast to imaging techniques, standard cadaver skull dis-
sections do not permit examination of the above mentioned critical areas of the skull
base without destruction of the skull specimen. Therefore it is necessary to also present
a representative variety of skull preparations, which this book seeks to do.
The most important blood vessels and nerves passing the bony foramina, foveae and fis-
sures have been labelled by colour. As this book is based on a collection of skulls, rare
or unknown anatomical variants may be illustrated which are commonly not or only
rarely found in anatomical atlases or standard medical textbooks. One example of a rare
anatomic variant is the variability of the foramen spinosum and the adjacent Spina
angularis, which are covered by the Tuba auditiva and the origins of M. tensor and the
levator veli palatini. These variants might gain some relevance for neuronavigation and
endoscopy because of the closeness of A. meningea media and the transitional area
between the Pars ossea and Pars cartilaginea tubae.
The author owes a particular debt of gratitude to the chairs of the departments of neu-
rosurgery in Freiburg (Prof. Zentner) and Giessen (Prof. Böker), and to the director of
the neurosurgical department in Zwickau (Prof. Warnke), and their coworkers, espe-
cially PD Dr. Kaminsky (Freiburg), Dr. Nestler, Dr. Preuss, and the oto-rhino-laryngol-
ogist PD Dr. Bockmühl (Giessen).
Dr. Astrid Weyerbrock has carefully revised and edited the manuscript.
The author is grateful to Ms. E. Rotermund, Professor Zentner’s secretary, for the typ-
ing and layout of the text.
I would especially like to thank the Springer Verlag Wien New York for its continuous
support and cooperation and excellent publication of my books for over 3 decades.
Freiburg i. Br., October 2009 Wolfgang Seeger
Contents
CHAPTERI
SURVEY (Figs. 1 to 8)
Overview (Figs. 1 to 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Topography of the endoscopic routes (Figs. 6 to 8) . . . . . . . . . . . . . . . . . . . . . . 3
CHAPTERII
CAVUM NASI AND FOSSA PTERYGOPALATINA (Figs. 9 to 17)
Overview (Figs. 9 to 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Cavum nasi (Fig. 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Hiatus maxillaris (Fig. 11)
Other paranasal sinuses (Fig. 12)
Atypical CSF leaks through the roof of Orbita
Pneumatization of the anterior clinoid process
CSF leaks from Canalis rotundus
Foramen sphenopalatinum and Fossa pterygopalatina (Figs. 13 to 19) . . . . . 24
Foramen sphenopalatinum
Fossa pterygopalatina
Vessels and nerves of the area of Foramen sphenopalatinum . . . . . . . . . . . . . 24
A. maxillaris
Branches in Fossa pterygopalatina
Branches medial to Foramen sphenopalatinum
Veins
Nerves
CHAPTERIII
SINUS SPHENOIDALIS AND
FOSSA PTERYGOPALATINA (Figs. 18 to 34)
Overview (Figs. 18 to 20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Sinus sphenoidalis (Figs. 19 and 20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Widening of adjacent structures (Figs. 27, 28 and 33)
Area between Sinus sphenoidalis and Foramen lacerum (Figs. 19 to 34) . . . . 47
Anterior wall of Sinus sphenoidalis
Foramen sphenopalatinum (Figs. 23 to 25)
Fossa pterygopalatina (Figs. 22 to 26, and 28 to 33)
Foramen lacerum and its contents (Figs. 23 to 31)
CHAPTERIV
TUBA AUDITIVA (EUSTACHII) (Figs. 35 to 40)
Overview (Figs. 35 and 36) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Pars cartilaginea (Figs. 35 to 40) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Pars ossea (C in fig. 37 and Fig. 40) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
CONTENTS VIII
CHAPTERV
PYRAMIS (PETROUS BONE, PARS PETROSA
PLUS PARS TYMPANICA)(Figs. 41 to 63)
Overview (Figs. 41 to 43) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Pyramis, schematic drawing (Figs. 42 and 43) . . . . . . . . . . . . . . . . . . . . . . . . . 103
Facies posterior pyramidis (Fig. 42)
Facies anterior pyramidis (Fig. 43)
Facies inferior pyramidis (Fig. 43)
Course of Canalis caroticus (Figs. 42 and 43)
Dorsal and basal axis of Pyramis (Figs. 44, 45, 47 and 48) . . . . . . . . . . . . . . . . 104
Cadaver skull dissections (Figs. 45 to 63) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Apex pyramidis, Facies posterior, anterior and inferior (Fig. 45)
Facies posterior pyramidis (Fig. 46)
Facies anterior pyramidis (Fig. 47)
Facies inferior pyramidis (Figs. 48 to 50)
Variants of Pyramis (Figs. 53 to 56) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Structures adjacent to Labyrinth (Figs. 60 to 63) . . . . . . . . . . . . . . . . . . . . . . . 105
Relationship of Canalis caroticus to the labyrinth bloc (Fig. 60)
Anterior area of the Labyrinth bloc (Fig. 60)
Area of Labyrinth, Apertura externa canalis carotici,
and of Fossa jugularis (Figs. 60 to 63)
CHAPTERVI
CLIVUS AREA AND PARS CONDYLARIS (Figs. 64 to 70)
Overview (Figs. 64 and 65) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Components of the Clivus area
Corpus sphenoidale
Pars basilaris of the occipital bone
Pars condylaris
Phylogenetic, ontogenetic and dysontogenetic aspects (Fig. 66) . . . . . . . . . . . 155
Basal extracranial Clivus area (Figs. 66 to 68) . . . . . . . . . . . . . . . . . . . . . . . . . 155
Dorsal intracranial Clivus area (Figs. 4, 5, and 65) . . . . . . . . . . . . . . . . . . . . . . 156
CHAPTERVII
SPECIAL SURGICAL ASPECTS. EXAMPLES (Figs. 71 to 79)
Planning strategies (Figs. 71 to 77) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
Imaging techniques (Figs. 71 to 74)
Measurements (Figs. 75 to 77)
Dural penetration point of N. abducens (Figs. 76 and 77)
Transnasal routes (Figs. 78 and 79) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175
SUBJECT INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
CHAPTER I
SURVEY
(Figs. 1 to 8)
3 SURVEY
Overview (Figs. 1 to 5)
The following figures illustrate the anatomical base of transnasal endoscopic
routes but not according to conventional anatomical views.
For better understanding, it is useful to give an overview of the well known anatomy as
shown in Figs. 1 to 5.
Topography of the endoscopic routes (Figs. 6 to 8)
The routes can be divided into five segments:
Cavum nasi and paranasal sinuses
Foramen sphenopalatinum and adjacent structures
Foramen lacerum and adjacent structures
Pyramis (petrous bone)
Area of Clivus
Cavum nasi and paranasal sinuses
Unusual and nearly unknown routes of CSF leaks are important, which occur more
frequently in extended transnasal endoscopy (Castelnuovo P, Locatelli D, 2007).
Other aspects of the transnasal routes are well known from pituitary surgery.
Foramen sphenopalatinum and adjacent structures
Foramen sphenopalatinum is located at the bony connection of the anterior inferior seg-
ment of Sinus sphenoidalis, Meatus nasi medius, and Fossa pterygopalatina. Its dorsal
margin corresponds to the anterior Apertura of Canalis pterygoideus.
Foramen lacerum
Its anterior margin corresponds to the posterior Apertura of Canalis pterygoideus. The
Canalis penetrates the base of Processus pterygoideus (for definition of the course of the
carotid artery between Sinus sphenoidalis and Foramen lacerum). Canalis pterygoideus
is an important landmark at surgery, as it defines the course of the carotid artery …
Pyramis (petrous bone)
Anterior area: A. carotis int. and its relationship to Tuba and A. meningea media
Posterior area: A. carotis int. and its relationship to Labyrinth, Tuba, Foramen jugulare
and Canalis n. hypoglossi.
SURVEY 4
SURVEY(Figs. 1 to 8)
Fig. 1
Overview